const LOCAL_KEY = "todolists"
export function getId() {
    return Date.now() + Math.random().toString(16).substr(2, 4);
}
// export function getTodoList() {
//     let result = localStorage.getItem(LOCAL_KEY);
//     if (result) {
//         return JSON.parse(result)
//     }
//     return [];
// }

// export function setTodoList(todos) {
//     localStorage.setItem(LOCAL_KEY, JSON.stringify(todos));
// }

export function filterTodoList(todos, visibility) {
    if (visibility === 'all') {
        return todos
    } else if (visibility === 'active') {
        return todos.filter(it => !it.completed)
    } else if (visibility === 'completed') {
        return todos.filter(it => it.completed)
    }
}